fixed is_file(): Passing null to parameter filename of type string is…

… deprecated (#71)

add support for thumbnail background alpha (#68)

Change file property visibility to protected (#63)

Added deleteOriginalFile option. #56 (#58)

* Added deleteSourceAfterThumbsGenerating option. #56

Min suppoer version PHP 5.6

Update readme

Add getUploadedFile method (#40)

Merge pull request #20 from AleksandrChernyavenko/master

Add ability to set thumbnail mode

Code style small fixes.

Merge pull request #11 from kotchuprik/master

added ArrayHelper use